The situation when a refrigerator Liebherr, known for its German reliability, ceases to maintain the required temperature, always causes panic. Products begin to deteriorate, and condensation appears on the shelves or, conversely, an ice crust appears where there should not be any. The owner of premium-class equipment expects flawless operation, but a collision with reality forces him to look for answers to the question of why the unit turned on, but does not produce cold.
Before calling a technician or disassembling the unit, it is important to carry out initial diagnostics in order to exclude common operating errors. Often the cause is not a breakdown, but incorrect installation or lost settings. However, if you are convinced that the equipment is connected correctly, and the temperature in the chambers is rising, then the problem lies deeper. In this article we will analyze in detail the technical and operational causes of malfunctions.
Violation of tightness and problems with the seal
The most common reason why a refrigerator Liebherr does not freeze lies in a violation of the thermal insulation of the circuit. If the door does not fit tightly, warm air from the room constantly penetrates into the chambers. The compressor begins to work in increased mode, trying to compensate for the heat influx, but often simply cannot cope with the volume of incoming heat. As a result, a temperature close to room temperature is established inside.
Particular attention should be paid to the rubber seal. Over time, the rubber dries out, cracks or becomes deformed, especially if the door is frequently slammed or caught by foreign objects. Even a microscopic gap of a few millimeters can negate the operation of the entire cooling system. Check the seal around the entire perimeter: it should be elastic, clean and fit tightly to the body.
⚠️ Attention! If you find cracks or creases in the seal, do not try to glue them together with superglue - this will only temporarily improve the appearance, but will not restore the seal. A complete replacement of the cuff is required.
Sometimes the problem lies not in the rubber itself, but in door hinges. If they are skewed or weakened, the geometry of the door is disrupted and it simply physically cannot close tightly. This often happens after transporting equipment or if too heavy bottles were placed on the door shelves, creating a distortion.
Malfunctions of the No Frost and defrosting system
In models with the system No Frost, the lack of cold is often associated with (clogged) air passages or malfunction of the evaporator defrost system. In such refrigerators, cold air is produced in a separate hidden compartment and blown by a fan into the chambers. If the evaporator becomes overgrown with ice, the fan stops moving air and cooling stops.
Several key elements are responsible for the defrosting process: Defrost heating element, defrost thermostat and timer (or an electronic module). If at least one of these components fails, ice freezes on the evaporator in a thick layer, blocking circulation. Visually, this can be manifested by the fact that it is still cold in the freezer, but in the refrigerator compartment it is already warm.
- 🧊 defrost heating element - a heating element that should be turned on periodically to melt the ice on evaporator; if it burns out, the ice does not melt.
- 🌡️ Defrost thermostat - a sensor that turns off the heating element when the ice has melted; its breakdown may result in defrosting not starting at all.
- ⏱️ Timer or board — controls operating cycles; a failure in the electronics results in the defrost command simply not being received.
Diagnostics of these components requires disassembling the back panel of the freezer and using a multimeter to check the resistance of the circuits. It is almost impossible to independently determine a burnt heating element without instruments, since outwardly it may look serviceable.
How to defrost a refrigerator for checking?
Disconnect the refrigerator from the network for 12-24 hours with the doors open. If after turning on it starts to freeze, then the problem was in the defrost system (frozen channel or evaporator).
Problems with the compressor and start relay
Compressor is the heart of the refrigerator Liebherr, and if it does not works, no cold will be produced. However, a silent unit does not always mean the death of the motor. Often the problem lies in start relay a small device that provides an impulse to start the engine. If the relay is stuck or burned out, the compressor will try to start, make a clicking sound and immediately stall.
There is also a risk of failure of the compressor itself. This may be an interturn short circuit of the windings or a mechanical wedge of the piston group. In modern inverter models Liebherr, diagnostics are complicated by the presence of complex control electronics, which can block starting at the slightest voltage surge.
| Symptom | Probable cause | Characteristic sound |
|---|---|---|
| Silent, no light | No power or module burned out | Silence |
| Beeps for 5-10 seconds and clicks | Faulty starting relay | Humming + clicking |
| Works constantly, without turning off | Freon leakage or compressor wear | Smooth hum |
| The motor housing gets very hot | Compressor wedge or overload | Hum with vibration |
If you hear the compressor humming, but does not start, under no circumstances leave it plugged in for a long time. This can lead to complete combustion of the motor windings, which will make repairs economically unfeasible.
☑️ Primary diagnostics of the compressor
Refrigerant leak and clogged capillary system
One of the most difficult causes to diagnose is freon leak. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tubes or evaporator, the gas gradually evaporates. As a result, the pressure in the system drops and freon stops boiling at the required temperature, without cooling the chambers. In models Liebherr with an evaporator foamed into the housing (system VarioSpace), it is extremely difficult to find the location of the leak.
Another common problem is clogged capillary tube. A blockage may form in the circulation system from compressor wear products or moisture. This prevents the movement of freon. The symptoms of a leak and a blockage are similar: the compressor works almost non-stop, but there is no cold, and the condenser (grid at the back) remains only partially cold or warm.
⚠️ Attention! Filling a refrigerator with freon and searching for leaks requires specialized equipment (vacuum pump, pressure gauge station). It is impossible to “add up” gas on your own.
It is important to note that modern refrigerators use environmentally friendly, but flammable refrigerants (for example, isobutane). Therefore, any work related to breaking the tightness of the circuit should be carried out in a well-ventilated area away from open fire.
Failures in the operation of the electronic control module
Modern refrigerators Liebherr are equipped with sophisticated electronic control modules that control temperature, fan and compressor operation. If the control board fails (voltage surge, moisture, manufacturing defect), it may stop sending signals to start the cooling elements. In this case, the refrigerator may light up and even beep, but not freeze.
Often the temperature indicator lights up on the display error code or flashes. For example, a series of errors F1, F2 or E1 may indicate a malfunction of the temperature sensors. If the module “does not see” the sensor, it does not turn on the compressor to avoid an emergency.
Diagnostics of the module requires testing the board tracks and checking the output signals. Sometimes the problem is solved by flashing or replacing burnt-out radio components, but in most cases it is necessary to replace the entire control unit.
The influence of external factors and improper operation
Do not discount external factors. If the refrigerator Liebherr is installed close to the wall or in a niche without proper ventilation, heat exchange is disrupted. The compressor overheats and goes into protection mode, stopping working. The influence of direct sunlight or the proximity of heating devices is also critical.
Loading the refrigerator with warm foods is another reason for a temporary refusal to freeze. The unit may simply not cope with the huge heat influx, especially if the door is open at the same time. In such cases, the equipment wears out, but the desired temperature is not achieved for a long time.
- 🌡️ Room temperature - if the room is too hot (above +30°C) or too cold (below +10°C), the refrigerator may not start or work incorrectly.
- 🚪 Frequent opening - leads to a constant influx warm, humid air, which causes freezing and malfunctions.
- 📦 Dense loading —if products lie close to the back wall or block the air supply channels, circulation is disrupted.
Check the temperature settings mode. Perhaps one of the household members accidentally switched the regulator to the “Vacation” mode or simply increased the temperature to the maximum. In models with a display, resetting the settings to factory settings often helps eliminate a software glitch.
Frequently asked questions (FAQ)
Why does the Liebherr refrigerator hum, but does not freeze?
This may indicate the compressor is running without load (freon leakage), a faulty starter relay or blockage of the capillary system. Diagnostics of the pressure in the circuit is required.
What to do if the red temperature indicator lights up?
The red indicator signals an increase in the temperature in the chamber. Check that the door is closed tightly and that you have not loaded warm food. If after 2-3 hours of operation the indicator does not go out, call a technician.
Is it possible to replace freon in Liebherr yourself?
No, this is impossible without professional equipment for vacuuming the system and dosed refilling. In addition, special soldering skills are required.
Why is it warm in the refrigerator compartment, but cold in the freezer?
Most often this is a sign of a malfunction of the No Frost system (the air supply channel is frozen) or a freon leak, when the residual cold is only enough for the freezer evaporator.